Drill and underreamer



A ril 19, 1932. G. F.. DILLON DRILL AND UNDERREAMER Filed May 24, 1930 2 Sheets-Sheet INVENTOR.

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April 19, 1932. G. F. DILLON DRILL AND UNDERREAMER Filed May 24, 1930 2 Sheets-Sheet 2 I N VEN TOR.

Patented Apr. 19, 1932 UNITED STATES GEORGE F. DILLON, F WIGHITA, KANSAS DRILL AND UNDERREAMER Application filed May 24,

This invention relates to a churn drill and underreamer for deep wells, the primary object being to provide a drill adapted to drill a hole of uniform diameter so that the entire string of casing in the well may be of uniform diameter. The drill is adapted to act as an underreamer to drill the hole slightly larger than the diameter of the casing.

The novelty of the invention will be understood by reference to the following description in connection with the accompanying drawings in which:

Fig. 1 is an elevational view of a drill construeted in accordance with my invention, the

cutting head being shown in expanded p0sition.

Fig. 2 is an edge view of the same.

Fig. 3 is an elevational view of the dril showing the cutting head in contracted position.

Fig. 4 is a view partly in section and partly in elevation showing the positions of the parts when the head is in expanded position.

Fig. 5 is a sectional view on the line 5-5 of Fig. 4.

Fig. 6 is a perspective view of the expander.

Fig. 7 is a perspective view of one of the cutter head members and Fig. 8 is a perspective viewof one of the latch pawls or detents for holding the expander in expanded position.

The invention is shown as comprising two expanding members 1 and 2 which carry the cutting head members 3 and 4 having teeth 5 and 6. The expanding members are elongated and they carry ribs or tongues 7 and 8 which engage grooves 9 and 10 "in an ex pander 11 which consists of an elongated bar having a wedge-shaped lower end 12. The two members 1 and 2 are connected by tieplates 13 and 14 each of which is provided with transversely elongated slots 15, 16, 17 and 18 through which headed fastening devices 19 project so that the members 1 and 2 and particularly the head members 3 and 4 may slide one'toward the other as well as move apartr Each head member is provided with an edge recess 20 in which is a flat spring 21 bearing against the tail-piece 22 of a pawl or detent 23 pivoted at 24 to the head so that 1930. Serial NO. 455,194.

there is a tendency for the pawl or detent to engage the shoulder 25 at the top of the spear point 12 to hold the expander in expanded position. The pawl or detent has a projection or lip 26 to engage the edge 01": the recess 27 in its particularmember 1 or 2 to hold it in expander-engaging position.

The lower end 28 of the tail-piece 22 is slightly curved as shown in Figure 8. The side edges of the spear 12 are inclined in opposite directions as shown at 29 and 30 and these are adapted to engage the inclined edges 31 and 32 of the plates 33 and 34 on the expanding members 1 and 2 so that when the expander 11 is raised by the table or suspending means, the edges 29 and 30 will ride on the edges 31 and 32 to bring the expanding members together to contracting positions so that the head will contract. I

When the parts are assembled as shown in Figure 3, the tool can be let down into the well until the cutters 5 and 6 strike the bottom. The expander is heavy enough to continue down to the positions shown in Figures 1 and 4 so that the wedge or spear 12 will pass between the head members 3 and 4 to expand them to their greatest diameter which will be slightly larger than the casing so that the drill acts as an underreamer. The expanding wedge or spear 12 will be held in position'by the detents or dogs 23.

When it is desired to withdraw the drill. the expander will be raised, this being per-- mitted because the shoulders 37-37 will engage the casing so that an upward pull will slide the tail-pieces 22 outwardly, permitting the expander to be raised until its edges 29 and 30 contact with the edges 31 and 32 of the plates 33 and 34. Whereupon the members 1 and 2 will be drawn together so that I the drill will be in a collapsed position as shown in Figure 3 whereupon the head consisting of the members 3 and 4 can be pulled up through the casing. The expander will have its upward movement limited by contact of the edges 29 and 30 with the edges of plates 33 and 34.

It will be observed that the slots 15, 16, 17 and 18 are long enough to permit the members 3 and 4 to move out to the fullest extent but they will be held in alinement by the tieplates 13 and 14. It will be observed that the device can be easily constructed, that it can be easily operated from a single line or cable connected to the end of the expander and running to the top of the well.

I do not wish to be limited to the exactde tails of construction shown but reserve the right to make changes in form, proportion and minor details of construction without departing from the spirit of my invention. 7

It will be clear that the fiat curved blade portions 37 on the detents 23 will contact with the lower edge of the casing when the drill and reamer is raised so that the upper portions of the detents will be swung inwardly. Then, the expander can be raised until the portions 29 and 30 engage the edges 31 and 32 of the plates 33 and 34 to cause the drill to collapse so that the tool can be pulled out of the well.

What I claim and desire to secure by Letters Patent is 1. A drill and underreamer for deep wells comprising two separate members having cutting portions at their lower ends, an expander between the members consisting of a longitudinally movable bar provided with an expanding wedge-shaped portion, insertable between the members, casing-engaging means for holding the expander in expanding position, tie-plates for loosely holding the members in co-operative relation and means carried by the members having inclined edges and co-operating with inclined edges on the expander to ride on the first inclined edges to draw the two members one toward the other into collapsing positions.

2. A device of the class described comprising two elongated members having drill head portions at their lower ends, means loosely connecting the members together, an elongated bar between the members having an expanding wedge portion insertable between the head portions, pivoted detents engaging shoulders on the members and a shoulder on the expander for holding the expander in expanding position and provided with casingengaging portions to cause the detents to move into expander releasing position and means for drawing the members together when the expander is moved out of expanding position.

3. A device of the class described comprising two elongated members having underreaming portions, an expander insertable between the underreaming portions to spread them apart, means ena-ging shoulders on the elongated members and a shoulder on the expander for holding the expander in expanding position and casing-engaging means on the first named means for moving the first named means to releasing position.

4. A device of the class described comprising two elongated members having underreaming portions, an elongated expander insertable between the underreaming portions, pivoted detents carried by the members to engage shoulders on the members and a shoulder on the expander and casing-engaging portions on the pivoted detents for releasing the detents from engagement with the expander.

5. A device of the class described comprising two elongated members having underreaming portions, an elongated expander insertable between the underreaming portions, pivoted detents carried by the members to engage the expander, said detents having enlarge-d curved casing-engaging portions for releasing the detents from engagement with the expander and co-operating means on the members and the expander for drawing the members together when the expander is moved out of expanding position.

6. A device of the class described comprising two elongated members having underreaming portions at their lower ends, an elongated expander insertable between the nnderreaming portions, said expander having an elongated slot between its ends, pivoted detents carried by the members having portions normally urged into the slot to bear against the end of the slot to hold the expander in expanding position and means on the detents to contact with the end of the casing in the well to move the detents out of engagement with the expander so that the expander can be moved away from the underreaming portions of the elongated members to permit the members to move together so thafi the device can be withdrawn from the we 7 A device of the class described comprising two elongated members in spaced relation, a sliding expander between the members having tongue and groove connection therewith and provided with an elongated slot, pivoted detents carried by the members having ends insertable through the slot to bear against one end of the slot to hold the expander in expanding position and means on the detents for engagement with the end of a well casing to cause the engaging ends of the detents to move out of engagement with the expander when the device is raised.

8. A device of the class described comprising two elongated members in spaced relation, a sliding expander between the members having tongue and groove connection therewith. and provided with an elongated slot, pivoted detents carried by the members having ends insertable through the slot to bear against one end of the slot to hold the expander in expanding position, means on the detents for engagement with the end of a well casing to cause the engaging ends of the detents to move out of engagement With the expander when the device is raised and means on the expander and the members in co-operative relation to positively move the two members together when the expander has moved a predetermined distance in one direction.

9. A device of the class described comprising two elongated members in spaced relation, a sliding expander between the members having tongue and groove connection therewith and provided with an elongated slot, pivoted detents carried by the members having ends insertable through the slot to bear against one end of the slot to hold the expander in expanding position, means on thedetents for engagement with the end of a well casing to cause the engaging ends of the detents to move out of engagement with the expander when the device is raised and means for limiting the sliding movement of the expander in one direction.

In testimony whereof I aflix my signature.

GEORGE F. DILLON. 

